feat(spike): add the M1 settings spike app and make targets

A separate throwaway app (own app ID, no permissions) that shows what the
Garmin Connect app delivers per settings field and writes values back, to
measure the undocumented settings limits on the real phone and watch.
Includes length-marked test strings, `make spike` / `make spike-sim`,
`make vectors`, and step-by-step instructions in docs/SETTINGS_SPIKE.md.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

1 files changed, 30 insertions, 0 deletions

diff --git a/spike/settings/test-strings/index.html b/spike/settings/test-strings/index.html
new file mode 100644
index 0000000..d330b52
--- /dev/null
+++ b/spike/settings/test-strings/index.html
@@ -0,0 +1,30 @@
+<!doctype html>
+<!-- Author:  cirakg & claude ai -->
+<!-- Summary: Settings spike test strings with copy buttons; open on the phone, copy, paste into a settings field. -->
+<html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1">
+<title>Settings spike test strings</title>
+<style>body{font-family:sans-serif;margin:16px}textarea{width:100%;font-family:monospace}
+button{font-size:1.1em;padding:6px 16px;margin:4px 0 16px}</style></head>
+<body><h1>Settings spike test strings</h1>
+<p>Tap Copy, then paste into one of the Text fields in the app settings. Expected lengths are in each heading.</p>
+<section><h2>100 characters</h2><textarea id="len-0100" readonly rows="3">N=100|abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrP0050stuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghEND</textarea><button onclick="copyText('len-0100')">Copy</button></section>
+<section><h2>255 characters</h2><textarea id="len-0255" readonly rows="3">N=255|abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrP0050stuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijkP0100lmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdP0150efghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwP0200xyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrEND</textarea><button onclick="copyText('len-0255')">Copy</button></section>
+<section><h2>256 characters</h2><textarea id="len-0256" readonly rows="3">N=256|abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrP0050stuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijkP0100lmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdP0150efghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwP0200xyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrsEND</textarea><button onclick="copyText('len-0256')">Copy</button></section>
+<section><h2>500 characters</h2><textarea id="len-0500" readonly rows="3">N=500|abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrP0050stuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijkP0100lmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdP0150efghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwP0200xyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopP0250qrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghiP0300jklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabP0350cdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuP0400vwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnP0450opqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdEND</textarea><button onclick="copyText('len-0500')">Copy</button></section>
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onclick="copyText('len-8000')">Copy</button></section>
+<section><h2>special characters</h2><textarea id="special" readonly rows="3">special: &amp; &lt; &gt; \ &quot; { } % | non-ASCII: äöü ß € 😀 | otpauth://totp/Fake:alice?secret=JBSWY3DPEHPK3PXP&amp;issuer=Fake&amp;digits=6 | {&quot;name&quot;:&quot;Fake&quot;,&quot;path&quot;:&quot;a\/b&quot;} END</textarea><button onclick="copyText('special')">Copy</button></section>
+<script>
+function copyText(id) {
+  const area = document.getElementById(id);
+  area.select();
+  const done = () => alert("Copied " + area.value.length + " characters");
+  if (navigator.clipboard && window.isSecureContext) {
+    navigator.clipboard.writeText(area.value).then(done, () => { document.execCommand("copy"); done(); });
+  } else { document.execCommand("copy"); done(); }
+}
+</script></body></html>